IPS-4 Model 8810 pages

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AMETEK

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PROCESS INSTRUMENTS

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Model 881-NSL H,S in Sulfur Pit Analyzer

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Direct Measurement

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AMETEK's No Sample Line

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technology for the sulfur pit. The

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881-NSL has no costly troublesome

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external sample line. The analyzer

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mounts directly on your sulfur pit lid,

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eliminating sample line plugging, the

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number one problem in Claus Plant

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analysis. The 881-NSL photometer

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combines an extraordinary long lamp

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life (estimated 5 years!) with many

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innovative features designed to

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minimize maintenance and increase

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reliability. The 881-NSL is equipped

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with anti-clogging blowback

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features. Any out-of-range condition

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automatically initiates air blowback to

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clear the sample system. This feature

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minimizes the chance of costly

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downtime by reducing sample line

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plugging. The analyzer continuously

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monitors itself for proper operation

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and has built-in alarm features.

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The Need

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H2S is entrained in liquid sulfur as it

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runs into the sulfur pit. Polysulfide

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compounds in the liquid sulfur break

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down with time to release H2S. H2S

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from these sources collects in the

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vapor space above the sulfur where

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it could exceed the lower explosive

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limit. To prevent an explosion,

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most pits are air purged to keep

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H2S levels low. Compressed air is

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expensive, and most plants run with

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an excessively low H2S level to be on

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the safe side. The AMETEK 881 -NSL

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Sulfur Pit Analyzer measures H2S in

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the vapor space above the sulfur pit.

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Substantial cost savings can be made

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using this reliable analyzer to control

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the H2S level giving an adequate

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safety margin. Some customers also

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want to measure S02 in the sulfur pit,

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reasoning that the presence of S02

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may indicate an incipient fire.

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Superior Benefits

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Direct Process Mounting Design

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Sample line plugging is the number

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one maintenance problem for all

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sulfur recovery analyzers. The 881 -

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NSL is installed directly on your sulfur

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pit lid; sample gas is drawn directly

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into the analyzer and returned to the

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process through the same sample

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tap. There is no need for a costly,

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heated sample line.

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Long Term Reliability

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Mechanical parts will wear and

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reduce analyzer reliability. The 881-

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NSL employs a heated air aspirated

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sample system eliminating the need

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for moving parts. The detector is solid

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state with no moving parts.

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Improved Plant Safety

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Achieved through continuous

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monitoring of the H2S content in

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the sulfur pit atmosphere to warn of

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buildup of explosive concentrations

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of H2S in the space above the liquid

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sulfur.

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Lower Operating Costs

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Save purge air by using the analyzer

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to control the H2S concentration at a

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safe level by adjusting the purge air

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flowrate.

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Integrated Worldwide Design

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The 881-NSL is optionally available

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as compliant with NEC/CSA or

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ATEX standards as well as other

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international standards.

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www.ametekpi.com

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